单项选择题
A.1.0MPa~1.2MPa B.1.2MPa~1.8MPa C.1.8MPa~2.5MPa D.2.0MPa~3.0MPa
A.1.5MPa~2.5MPa B.2.5MPa~3.5MPa C.3.5MPa~4.5MPa D.4.5MPa~5.5MPa
A.4.0MPa~6.0MPa B.6.0MPa~8.0Mpa C.8.0MPa~10.0MPa D.10.0MPa~12.0MPa